Bringing any type of drug into or out of a country is illegal in most places, so don’t bring them with you when traveling (or at least make sure it’s legal first).
Driving under influence of drugs is also illegal in most places, and for good reason. Do not drive under influence to avoid any problems.
Many places do not allow the use of drugs in public, even when they are legalized for recreational use. Make sure it is legal before lighting a joint in a public place.
Colorado is one of the states where cannabis was socially accepted by quite some time. It was also one of the first states that completely legalized marijuana both for medical use on November 2000, and recreational use on November 2012. Residents even celebrate an annual 4/20 event, where the police tolerates consuming marijuana in public.
Residents of Colorado have many marijuana stores and dispensaries to choose from, so whether you are a medical or recreational consumer, finding a place to buy your favorite strains should not be a problem.
There are many lands in Colorado that are regulated by federal law, which means marijuana is illegal there in any form. If you are a visiting tourist, make sure you are not using any cannabis products on federal land such as national parks, forests, ski resorts and similar places, or you may find yourself in some unwanted trouble.
Keep consuming your medicine in private, becase as with most places, it is still illegal to do so in public. Using a vaporizer also helps with the discreetness, and your lungs will thank you for not inhaling as much smoke.